Gin-saw gummer and sharpener



G. W. DAVIS. GIN SAW GYUMMER AND S-HARPENER.

(No Model.)

Pdtented Aug. 18,1891

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GEORGE IV. DAVIS, OF

ATENT Enron.

MEMPHIS, TENNESSEE.

GIN-SAW GUMMER AND SHARPENER.

SPECIFICATION forming part of Letters Patent No. 458,124, dated August18, 1891.

Application filed October 8, 1890. Serial No. 367,439. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE W. DAVIS, a citizen of the United States, anda resident of Memphis, in the county of Shelby and State of Tennessee,have invented certain new and useful Improvements in Gin-Saw Gummers andSharpeners; and I do hereby declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same,reference being had to the accompanying drawings, and to letters ofreference marked thereon, which form a part of this specification.

This invention relates to machines for sharpening the teeth of the sawsforming part of cotton-gins, having more essential reference toroughingoutandsmoothingtheteethbymeans of a punch and a circular file,respectively, the invention consisting of means for applying theseimplements in successive order and of governing the angle of suchapplication to the tooth, together with such additional devices as arenecessarily employed in the operation, all of which are hereinafterfully described, and the parts claimed as new specifically pointed outin the claims.

In the accompanying drawings,.Figure 1 is a side elevation of thedevice, and Fig. 2 is a View of the opposite side from that shown inFig. 1, being also in side elevation. Fig. 3 is a detail of thepunch-lever and cam, together with the saw and die, the same being asseen in the direction of the arrow 3 in Fig. 1. Fig. 4: are details infront and side elevations of the file and spiral feeding-lip. Fig. 5 isa side view of the die, showing two forms of construction of aperturestherein. Fig. 6 is a detail of the mandrel-carrying frame and back-guideand special saw-guide clamp.

In the figures like reference-marks indicate corresponding parts in theseveral views.

The frame A is of metal, and may have, if desired, anupwardly-projecting handle a, and its body may be formed into anotherhandle a. On the forward end of the frame are carried the saw-guides (band a which rest on the periphery and on the sides of the saw,respectively, the guide a carrying a swiveled bearin g-block a", whichmay be grooved, if thought necessary, and the guide a being formed bythe slitting of the downwardlyprojecting arm, said slit beingapproximately as wide as the saw is thick. Pivoted to the bifurcatedback end of the frame A is the frame B, which carries the file-mandrelO, to which is secured the file D by means of the nut 12.

The frame 13 is adjustable on its pivotal point by means of thesegmental arm 0', which enters a suitable aperture in the frame A andwith which contacts the thumb-screw 0 which enters through the side ofsaid aperture, being screw-threaded therein for the purpose. The lip 0is a radially-extending arm of sheet-steel, the part c of which is setspirally or at an angle with the plane of revolution of the file, thepoint e catching in the next tooth and feeding the saw one tooth as thefile is revolved from the time of catching.

Attached to the mandrel G is a crank E, by means of which it andconsequently the file D, secured thereto, are revolved. The arm F,secured to the frame B by means of the screw f has motion longitudinallythereon by reason of the slotfin the base of said arm F. Said arm Fcarries the shoe f, which bears on the saw, as shown in Figs. 1 and 2,and holds the machine stationary as regards the center of the saw. It isobvious that any adjustment of the arm F on its bearing on the frame Bwill cause the machine to raise or lower from or to the saw, and thusallow the file D to work in the tooth above or the one below that inwhich it was seated before the adjustment.

Pivoted to the ear I) on the frame B and extending forwardly to thedownwardly-projecting arm forming the guide a", or to some otherconvenient position, is a curved arm G, the bend g of which is slittedto fit over the saw, having a web g, Fig. 2, within one-half of thecurved portion, the inner face of which web is at a short distance fromthe saw and to which is secured the female die II, which will behereinafter described end of the arm G is slotted, and a screw g passesthrough this slot into the arm a or other suitable point. This slotallows the adjustment of the arm G and parts carried thereby to and fromthe saw. The part g Fig. 2, of said arm is on each side of the saw, sothe file when turned in either direction will The forward 7 press thesaw against one side of the slit. The die II, which is best shown inFig. 5, is seated on the web y in the downward bend of the arm G, theface of said die almost touching the saw when in position and one of theapertures 72 therein being so placed that when in correct adjustment itwill exactly coincide as to form and position with the illterdentalspace which it is desired to make. Attached to the arm G in a suitableposition are the lugs 9 through which pass pivotscrews Z, on thetapering ends of which, by means of corresponding indentations, ispivoted the lever 1, best shown in Figs. 1 and 3, which extendsupwardly, and is so oscillated on the pivotal bearingjust described bymeans of the cam j on the shaft J, said shaft being bent upwardly at'its back end and forming a leverj. Said shaftJ is journaled in bearings9' and 3' on the arm G and head B,respectively. The bearing j iscomposed of two lugs a short distance apart, while between them andremovably secured to the shaft J and revolving therewith is a collarjwhich prevents longitudinal play of the shaft- 1 and allows itswithdrawal from the bearingj when it is desired to turn back the leverIfor the purpose of inserting a punch orother operation. The motiontoward the saw of the lever I is resisted by a flat spring i which issecured to the arm G and is seated in the groove i, Fig. 3. Pivotallyseated within a recess in the lever I is the male die K, which has aleader 7a, projecting beyond the working face 7; of said die K and ashort distance into the female die II. This tapered leader is slightlynarrower at its base than the body of the punch, which difference formsthe cutting-shoulder, and the depth of the out into the gum is the sameas this difference. By reason of its angular face the male die has ashearing cut in operation, and owing to its being pivoted in the lever Iit will be guided in cutting by the part 72.. Limiting the movement ofsaid punch on its pivot by the impingement thereon of the leader 7L andpivoting by means of a pin, as shown, forms a very desirable manner ofsecuring the male die, as all that is necessary to replace a worn one isthe removal of the pivoting-pin and its replacement.

The operation of this device is as follows: The machine being set on oneof the saws of the cylinder in such a manner that the guide a rests overthe saw and the blocks a" and f contact with the periphery thereof, thesaw being between the two halves of the downwardly-extending portion ofthe arm G, the file-frame B is then, by means of the block f and themovement .of the segmental arm 0, the movement of which into or out ofthe recess in the frame A being allowed by the loosening of the screw 0brought into such a position that the file D will set at the properangle to fit the intcrdental spaces when the tooth is the desired form,which adjustment 'will also effect the position, the arm G carrying themale and female dies thereon, as hereinhefore specified, which effectwill be connteracted and the said arm, and hence the dies, be broughtinto proper position to cut or enlarge the said interdental spaces bymov ng said arm, which is allowed by the loosen ng of the set-screw g.The operation of cutting and subsequently filing the teeth is thenproceeded with, alternately giving the file D, and hence the spiralfeeding leaf or 11p 0, one revolution and pulling down the lever 7.which out between the teeth, the cut edges being dressed and smoothed upby means of the file D.

In case it is desired to file and not to punch the teeth the punchingdevice will be removed and a frame B, having a slitted hook 0 will beemployed in lieu of the part g of the arm G.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

I. In a device of the class specified, the combination of the frame A,the saw-guides attached to the front end of the frame, the frame 13,pivoted at its rear end to the rear end of the frame A, theadjusting-arm 0, connecting the frame B at its front end with the frameA, the mandrel journaled in the frame B, the file attached to the frontend of the mandrel, the crank E, secured to the rear end of the mandrel,and the adjustable support F, secured to the rear end of the frame B,substantially as described.

In a device of the class specified, the combination of the frame A, thesaw-guides attached to the front end of the said frame, the adjustableframe I3, pivoted at its rear end to the rear end of the frame A, theretatable mandrel journaled in the frame B, the file carried by the saidmandrel, the adj ustable support F, secured to the rear end of the frameB, and the adjustable bifurcated arm G, connecting the front end of theframe B with the front end of the frame A, forming a guide,substantially as described.

3. In a device of the class specified, the combination of the frame A,the guides attached to the front end of the said frame, the adjustableframe B, pivoted to the rear end of the frame A, the adjustablebifurcated arm G, connecting the free end of the frame B to the frame A,the female die If, carried by the said arm, the lever I, pivoted to thesaid arm, the punch carried by the said lever, the rotatable shaft J,mounted in bearings in the arm G and the frame B, and the cam j, mountedon the said shaft and engaging with the free end of the lever I,substantially as described.

4.. In a device of the class specified, the frame A, having securedthereto the arm G, having a downwardly-proj ecting curved portionadapted to fit over the saw and being slotted to receive said saw, saidarm carry IIO ing on one side of the saw a female die and In testimonywhereof l heieiinto affix my on the other side of said saw the lever I,signature in presence of two Witnesses. pivoted thereto and carrying amale die adapted to enter the apertures in the said GEQWV. DAVIS. femaledie, and means for operating said male die, all combined, arranged, andoper- \Vitnesses:

at-ing substantially as and for the purpose L. F. SHIPLEY,

specified. A. M. DENTON.

